Question

Yesenia took three tests in her accounting class. She scored 91 points on her first test and 73 points on her second test. If her average for the three tests is 79, what score did she get on her third test?

Answer 1

Let t represent Yesenia's score on the third test. If her average is 79 for the three tests, then]
.. (91 +73 +t)/3 = 79
.. 164 +t = 237
.. t = 237 -164 = 73

Yesenia's score on the third test is 73.

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You can also look at points relative to the average. On her first test, Yesenia scored 12 points above her average. On her second test, 6 points below her average. In order to make the total relative to the average come out to be zero, she must have also scored 6 points below average on the third test, or 79 -6 = 73.